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10#include <linux/errno.h>
11#include <linux/kernel.h>
12#include <linux/mm.h>
13#include <linux/ptrace.h>
14#include <linux/tracehook.h>
15#include <linux/sched.h>
16#include <linux/signal.h>
17#include <linux/smp.h>
18#include <linux/stddef.h>
19#include <linux/tty.h>
20#include <linux/binfmts.h>
21#include <linux/unistd.h>
22#include <linux/wait.h>
23
24#include <asm/intrinsics.h>
25#include <asm/uaccess.h>
26#include <asm/rse.h>
27#include <asm/sigcontext.h>
28
29#include "sigframe.h"
30
31#define DEBUG_SIG 0
32#define STACK_ALIGN 16
33
34#if _NSIG_WORDS > 1
35# define PUT_SIGSET(k,u) __copy_to_user((u)->sig, (k)->sig, sizeof(sigset_t))
36# define GET_SIGSET(k,u) __copy_from_user((k)->sig, (u)->sig, sizeof(sigset_t))
37#else
38# define PUT_SIGSET(k,u) __put_user((k)->sig[0], &(u)->sig[0])
39# define GET_SIGSET(k,u) __get_user((k)->sig[0], &(u)->sig[0])
40#endif
41
42asmlinkage long
43sys_sigaltstack (const stack_t __user *uss, stack_t __user *uoss, long arg2,
44 long arg3, long arg4, long arg5, long arg6, long arg7,
45 struct pt_regs regs)
46{
47 return do_sigaltstack(uss, uoss, regs.r12);
48}
49
50static long
51restore_sigcontext (struct sigcontext __user *sc, struct sigscratch *scr)
52{
53 unsigned long ip, flags, nat, um, cfm, rsc;
54 long err;
55
56
57 current_thread_info()->restart_block.fn = do_no_restart_syscall;
58
59
60 err = __get_user(flags, &sc->sc_flags);
61 err |= __get_user(nat, &sc->sc_nat);
62 err |= __get_user(ip, &sc->sc_ip);
63 err |= __get_user(cfm, &sc->sc_cfm);
64 err |= __get_user(um, &sc->sc_um);
65 err |= __get_user(rsc, &sc->sc_ar_rsc);
66 err |= __get_user(scr->pt.ar_unat, &sc->sc_ar_unat);
67 err |= __get_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr);
68 err |= __get_user(scr->pt.ar_pfs, &sc->sc_ar_pfs);
69 err |= __get_user(scr->pt.pr, &sc->sc_pr);
70 err |= __get_user(scr->pt.b0, &sc->sc_br[0]);
71 err |= __get_user(scr->pt.b6, &sc->sc_br[6]);
72 err |= __copy_from_user(&scr->pt.r1, &sc->sc_gr[1], 8);
73 err |= __copy_from_user(&scr->pt.r8, &sc->sc_gr[8], 4*8);
74 err |= __copy_from_user(&scr->pt.r12, &sc->sc_gr[12], 2*8);
75 err |= __copy_from_user(&scr->pt.r15, &sc->sc_gr[15], 8);
76
77 scr->pt.cr_ifs = cfm | (1UL << 63);
78 scr->pt.ar_rsc = rsc | (3 << 2);
79
80
81 scr->pt.cr_iip = ip & ~0x3UL;
82 ia64_psr(&scr->pt)->ri = ip & 0x3;
83 scr->pt.cr_ipsr = (scr->pt.cr_ipsr & ~IA64_PSR_UM) | (um & IA64_PSR_UM);
84
85 scr->scratch_unat = ia64_put_scratch_nat_bits(&scr->pt, nat);
86
87 if (!(flags & IA64_SC_FLAG_IN_SYSCALL)) {
88
89 err |= __get_user(scr->pt.ar_ccv, &sc->sc_ar_ccv);
90 err |= __get_user(scr->pt.b7, &sc->sc_br[7]);
91 err |= __get_user(scr->pt.r14, &sc->sc_gr[14]);
92 err |= __copy_from_user(&scr->pt.ar_csd, &sc->sc_ar25, 2*8);
93 err |= __copy_from_user(&scr->pt.r2, &sc->sc_gr[2], 2*8);
94 err |= __copy_from_user(&scr->pt.r16, &sc->sc_gr[16], 16*8);
95 }
96
97 if ((flags & IA64_SC_FLAG_FPH_VALID) != 0) {
98 struct ia64_psr *psr = ia64_psr(&scr->pt);
99
100 err |= __copy_from_user(current->thread.fph, &sc->sc_fr[32], 96*16);
101 psr->mfh = 0;
102 preempt_disable();
103 if (psr->dfh)
104 ia64_drop_fpu(current);
105 else {
106
107 __ia64_load_fpu(current->thread.fph);
108 ia64_set_local_fpu_owner(current);
109 }
110 preempt_enable();
111 }
112 return err;
113}
114
115int
116copy_siginfo_to_user (siginfo_t __user *to, siginfo_t *from)
117{
118 if (!access_ok(VERIFY_WRITE, to, sizeof(siginfo_t)))
119 return -EFAULT;
120 if (from->si_code < 0) {
121 if (__copy_to_user(to, from, sizeof(siginfo_t)))
122 return -EFAULT;
123 return 0;
124 } else {
125 int err;
126
127
128
129
130
131
132
133 err = __put_user(from->si_signo, &to->si_signo);
134 err |= __put_user(from->si_errno, &to->si_errno);
135 err |= __put_user((short)from->si_code, &to->si_code);
136 switch (from->si_code >> 16) {
137 case __SI_FAULT >> 16:
138 err |= __put_user(from->si_flags, &to->si_flags);
139 err |= __put_user(from->si_isr, &to->si_isr);
140 case __SI_POLL >> 16:
141 err |= __put_user(from->si_addr, &to->si_addr);
142 err |= __put_user(from->si_imm, &to->si_imm);
143 break;
144 case __SI_TIMER >> 16:
145 err |= __put_user(from->si_tid, &to->si_tid);
146 err |= __put_user(from->si_overrun, &to->si_overrun);
147 err |= __put_user(from->si_ptr, &to->si_ptr);
148 break;
149 case __SI_RT >> 16:
150 case __SI_MESGQ >> 16:
151 err |= __put_user(from->si_uid, &to->si_uid);
152 err |= __put_user(from->si_pid, &to->si_pid);
153 err |= __put_user(from->si_ptr, &to->si_ptr);
154 break;
155 case __SI_CHLD >> 16:
156 err |= __put_user(from->si_utime, &to->si_utime);
157 err |= __put_user(from->si_stime, &to->si_stime);
158 err |= __put_user(from->si_status, &to->si_status);
159 default:
160 err |= __put_user(from->si_uid, &to->si_uid);
161 err |= __put_user(from->si_pid, &to->si_pid);
162 break;
163 }
164 return err;
165 }
166}
167
168long
169ia64_rt_sigreturn (struct sigscratch *scr)
170{
171 extern char ia64_strace_leave_kernel, ia64_leave_kernel;
172 struct sigcontext __user *sc;
173 struct siginfo si;
174 sigset_t set;
175 long retval;
176
177 sc = &((struct sigframe __user *) (scr->pt.r12 + 16))->sc;
178
179
180
181
182
183
184
185 retval = (long) &ia64_leave_kernel;
186 if (test_thread_flag(TIF_SYSCALL_TRACE)
187 || test_thread_flag(TIF_SYSCALL_AUDIT))
188
189
190
191
192
193
194 retval = (long) &ia64_strace_leave_kernel;
195
196 if (!access_ok(VERIFY_READ, sc, sizeof(*sc)))
197 goto give_sigsegv;
198
199 if (GET_SIGSET(&set, &sc->sc_mask))
200 goto give_sigsegv;
201
202 set_current_blocked(&set);
203
204 if (restore_sigcontext(sc, scr))
205 goto give_sigsegv;
206
207#if DEBUG_SIG
208 printk("SIG return (%s:%d): sp=%lx ip=%lx\n",
209 current->comm, current->pid, scr->pt.r12, scr->pt.cr_iip);
210#endif
211
212
213
214
215 do_sigaltstack(&sc->sc_stack, NULL, scr->pt.r12);
216 return retval;
217
218 give_sigsegv:
219 si.si_signo = SIGSEGV;
220 si.si_errno = 0;
221 si.si_code = SI_KERNEL;
222 si.si_pid = task_pid_vnr(current);
223 si.si_uid = from_kuid_munged(current_user_ns(), current_uid());
224 si.si_addr = sc;
225 force_sig_info(SIGSEGV, &si, current);
226 return retval;
227}
228
229
230
231
232
233
234
235static long
236setup_sigcontext (struct sigcontext __user *sc, sigset_t *mask, struct sigscratch *scr)
237{
238 unsigned long flags = 0, ifs, cfm, nat;
239 long err = 0;
240
241 ifs = scr->pt.cr_ifs;
242
243 if (on_sig_stack((unsigned long) sc))
244 flags |= IA64_SC_FLAG_ONSTACK;
245 if ((ifs & (1UL << 63)) == 0)
246
247 flags |= IA64_SC_FLAG_IN_SYSCALL;
248 cfm = ifs & ((1UL << 38) - 1);
249 ia64_flush_fph(current);
250 if ((current->thread.flags & IA64_THREAD_FPH_VALID)) {
251 flags |= IA64_SC_FLAG_FPH_VALID;
252 err = __copy_to_user(&sc->sc_fr[32], current->thread.fph, 96*16);
253 }
254
255 nat = ia64_get_scratch_nat_bits(&scr->pt, scr->scratch_unat);
256
257 err |= __put_user(flags, &sc->sc_flags);
258 err |= __put_user(nat, &sc->sc_nat);
259 err |= PUT_SIGSET(mask, &sc->sc_mask);
260 err |= __put_user(cfm, &sc->sc_cfm);
261 err |= __put_user(scr->pt.cr_ipsr & IA64_PSR_UM, &sc->sc_um);
262 err |= __put_user(scr->pt.ar_rsc, &sc->sc_ar_rsc);
263 err |= __put_user(scr->pt.ar_unat, &sc->sc_ar_unat);
264 err |= __put_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr);
265 err |= __put_user(scr->pt.ar_pfs, &sc->sc_ar_pfs);
266 err |= __put_user(scr->pt.pr, &sc->sc_pr);
267 err |= __put_user(scr->pt.b0, &sc->sc_br[0]);
268 err |= __put_user(scr->pt.b6, &sc->sc_br[6]);
269 err |= __copy_to_user(&sc->sc_gr[1], &scr->pt.r1, 8);
270 err |= __copy_to_user(&sc->sc_gr[8], &scr->pt.r8, 4*8);
271 err |= __copy_to_user(&sc->sc_gr[12], &scr->pt.r12, 2*8);
272 err |= __copy_to_user(&sc->sc_gr[15], &scr->pt.r15, 8);
273 err |= __put_user(scr->pt.cr_iip + ia64_psr(&scr->pt)->ri, &sc->sc_ip);
274
275 if (!(flags & IA64_SC_FLAG_IN_SYSCALL)) {
276
277 err |= __put_user(scr->pt.ar_ccv, &sc->sc_ar_ccv);
278 err |= __put_user(scr->pt.b7, &sc->sc_br[7]);
279 err |= __put_user(scr->pt.r14, &sc->sc_gr[14]);
280 err |= __copy_to_user(&sc->sc_ar25, &scr->pt.ar_csd, 2*8);
281 err |= __copy_to_user(&sc->sc_gr[2], &scr->pt.r2, 2*8);
282 err |= __copy_to_user(&sc->sc_gr[16], &scr->pt.r16, 16*8);
283 }
284 return err;
285}
286
287
288
289
290static inline int
291rbs_on_sig_stack (unsigned long bsp)
292{
293 return (bsp - current->sas_ss_sp < current->sas_ss_size);
294}
295
296static long
297force_sigsegv_info (int sig, void __user *addr)
298{
299 unsigned long flags;
300 struct siginfo si;
301
302 if (sig == SIGSEGV) {
303
304
305
306
307
308
309
310
311
312 spin_lock_irqsave(¤t->sighand->siglock, flags);
313 current->sighand->action[sig - 1].sa.sa_handler = SIG_DFL;
314 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
315 }
316 si.si_signo = SIGSEGV;
317 si.si_errno = 0;
318 si.si_code = SI_KERNEL;
319 si.si_pid = task_pid_vnr(current);
320 si.si_uid = from_kuid_munged(current_user_ns(), current_uid());
321 si.si_addr = addr;
322 force_sig_info(SIGSEGV, &si, current);
323 return 0;
324}
325
326static long
327setup_frame (int sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *set,
328 struct sigscratch *scr)
329{
330 extern char __kernel_sigtramp[];
331 unsigned long tramp_addr, new_rbs = 0, new_sp;
332 struct sigframe __user *frame;
333 long err;
334
335 new_sp = scr->pt.r12;
336 tramp_addr = (unsigned long) __kernel_sigtramp;
337 if (ka->sa.sa_flags & SA_ONSTACK) {
338 int onstack = sas_ss_flags(new_sp);
339
340 if (onstack == 0) {
341 new_sp = current->sas_ss_sp + current->sas_ss_size;
342
343
344
345
346
347
348 if (!rbs_on_sig_stack(scr->pt.ar_bspstore))
349 new_rbs = ALIGN(current->sas_ss_sp,
350 sizeof(long));
351 } else if (onstack == SS_ONSTACK) {
352 unsigned long check_sp;
353
354
355
356
357
358
359 check_sp = (new_sp - sizeof(*frame)) & -STACK_ALIGN;
360 if (!likely(on_sig_stack(check_sp)))
361 return force_sigsegv_info(sig, (void __user *)
362 check_sp);
363 }
364 }
365 frame = (void __user *) ((new_sp - sizeof(*frame)) & -STACK_ALIGN);
366
367 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
368 return force_sigsegv_info(sig, frame);
369
370 err = __put_user(sig, &frame->arg0);
371 err |= __put_user(&frame->info, &frame->arg1);
372 err |= __put_user(&frame->sc, &frame->arg2);
373 err |= __put_user(new_rbs, &frame->sc.sc_rbs_base);
374 err |= __put_user(0, &frame->sc.sc_loadrs);
375 err |= __put_user(ka->sa.sa_handler, &frame->handler);
376
377 err |= copy_siginfo_to_user(&frame->info, info);
378
379 err |= __put_user(current->sas_ss_sp, &frame->sc.sc_stack.ss_sp);
380 err |= __put_user(current->sas_ss_size, &frame->sc.sc_stack.ss_size);
381 err |= __put_user(sas_ss_flags(scr->pt.r12), &frame->sc.sc_stack.ss_flags);
382 err |= setup_sigcontext(&frame->sc, set, scr);
383
384 if (unlikely(err))
385 return force_sigsegv_info(sig, frame);
386
387 scr->pt.r12 = (unsigned long) frame - 16;
388 scr->pt.ar_fpsr = FPSR_DEFAULT;
389 scr->pt.cr_iip = tramp_addr;
390 ia64_psr(&scr->pt)->ri = 0;
391 ia64_psr(&scr->pt)->be = 0;
392
393
394
395
396
397
398
399
400 scr->pt.cr_ifs = (1UL << 63);
401
402
403
404
405
406 scr->scratch_unat = 0;
407
408#if DEBUG_SIG
409 printk("SIG deliver (%s:%d): sig=%d sp=%lx ip=%lx handler=%p\n",
410 current->comm, current->pid, sig, scr->pt.r12, frame->sc.sc_ip, frame->handler);
411#endif
412 return 1;
413}
414
415static long
416handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
417 struct sigscratch *scr)
418{
419 if (!setup_frame(sig, ka, info, sigmask_to_save(), scr))
420 return 0;
421
422 signal_delivered(sig, info, ka, &scr->pt,
423 test_thread_flag(TIF_SINGLESTEP));
424
425 return 1;
426}
427
428
429
430
431
432void
433ia64_do_signal (struct sigscratch *scr, long in_syscall)
434{
435 struct k_sigaction ka;
436 siginfo_t info;
437 long restart = in_syscall;
438 long errno = scr->pt.r8;
439
440
441
442
443
444 while (1) {
445 int signr = get_signal_to_deliver(&info, &ka, &scr->pt, NULL);
446
447
448
449
450
451
452
453 if ((long) scr->pt.r10 != -1)
454
455
456
457
458
459
460 restart = 0;
461
462 if (signr <= 0)
463 break;
464
465 if (unlikely(restart)) {
466 switch (errno) {
467 case ERESTART_RESTARTBLOCK:
468 case ERESTARTNOHAND:
469 scr->pt.r8 = EINTR;
470
471 break;
472
473 case ERESTARTSYS:
474 if ((ka.sa.sa_flags & SA_RESTART) == 0) {
475 scr->pt.r8 = EINTR;
476
477 break;
478 }
479 case ERESTARTNOINTR:
480 ia64_decrement_ip(&scr->pt);
481 restart = 0;
482 }
483 }
484
485
486
487
488
489 if (handle_signal(signr, &ka, &info, scr))
490 return;
491 }
492
493
494 if (restart) {
495
496 if (errno == ERESTARTNOHAND || errno == ERESTARTSYS || errno == ERESTARTNOINTR
497 || errno == ERESTART_RESTARTBLOCK)
498 {
499
500
501
502
503
504 ia64_decrement_ip(&scr->pt);
505 if (errno == ERESTART_RESTARTBLOCK)
506 scr->pt.r15 = __NR_restart_syscall;
507 }
508 }
509
510
511
512 restore_saved_sigmask();
513}
514